Signal-to-noise ratio enhancing touch sensing apparatus using charge pump method
a touch sensing apparatus and signal-to-noise ratio technology, applied in the field of touch sensing, can solve the problems of touch point misjudgment, low rate, and serious impact on the operation of the touch control chip, and achieve the effect of reducing the external environment, facilitating the whole system to report, and preventing interference to touch sensing
Inactive Publication Date: 2014-06-03
RAYDIUM SEMICON
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Benefits of technology
The touch sensing apparatus uses a special technique called charge pump to function like an analog adder, which reduces interference from the liquid crystal panel and external environment. This improves the accuracy of touch sensing and reduces misjudgment. Additionally, without using any amplifier, the apparatus obtains high signal-to-noise amplified analog data, which allows for smaller die size and lower cost.
Problems solved by technology
However, the above-mentioned conventional LCD touch sensing method has serious drawbacks, such as the scanning rate is too low, the operation of the touch control chip is seriously affected by the noise generated by the display panel, even the touch point is misjudged.
In order to avoid the noise generated by the panel, a layer of insulating material is disposed between the ITO sensor and the panel; however, this method will increase the cost, and the thickness of the entire apparatus will be increased, it is unfavorable to the design of mechanism.
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Embodiment Construction
[0014]A first embodiment of the invention is a touch sensing apparatus. In this embodiment, the touch sensing apparatus can be a mutual inductance capacitor touch sensing apparatus capable of sensing a plurality of data from an ITO sensor at the same time and avoiding the misjudgment of touch points caused by the sensed data affected by the noise of the LCD panel.
[0015]Please refer to FIG. 1. FIG. 1 illustrates a schematic figure of the touch sensing apparatus sensing the touch points on an ITO sensor in the invention. As shown in FIG. 1, the liquid crystal display includes an ITO sensor 100 and a touch sensing apparatus 1. In general, the LCD panel is attached under the ITO sensor 100, but not limited to this. The touch sensing apparatus 1 includes a logic control module 10, a plurality of pins 20, at least one driving / sensing module 30, at least one storage control module 40, at least one decoding control module 50, and an analog / digital converting module 70.
[0016]Wherein, the dri...
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A touch sensing apparatus is disclosed. The touch sensing apparatus includes a logic control module, at least one storage control module, and at least one decoding control module. The logic control module is used to generate a plurality of control signals having different control timings. The plurality of control signals includes a storage control signal and a decoding control signal. Each storage control module includes a plurality of storage capacitors, and respectively stores each of sensed voltages in different storage capacitors at different times according to a storage control timing of the storage control signal. The sensed voltages are analog data sensed from scan lines of an ITO sensor. The decoding control module performs analog adding process to the sensed voltages stored in the storage capacitors according to a decoding control timing of the decoding control signal to output decoded analog data with high signal-to-noise ratio (SNR).
Description
BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The invention relates to touch sensing, in particular, to a touch sensing apparatus using the charge pump concept to realize the function of analog adder, so that the interference to touch sensing caused by the liquid crystal panel and external environment noise will be reduced to enhance system signal-to-noise ratio (SNR) without an amplifier to lower the cost.[0003]2. Description of the Prior Art[0004]With the rapid progress of technology, the conventional display has been replaced by TFT-LCD gradually, and the TFT-LCD is widely used in various electronic products such as television, flat display, mobile, tablet PC, and projector. As to the TFT-LCD with touch control function, touch sensor is one of the important modules of the TFT-LCD, and the performance of the touch sensor will also directly affect the entire effectiveness of the TFT-LCD.[0005]In general, the conventional LCD with mutual inductance capacitor touch ...
Claims
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IPC IPC(8): G06F3/041
CPCG06F3/0416G06F3/044G06F3/04166G06F3/0446
InventorCHAN, CHIEN-YUWANG, CHIEN-KUOTANG, SHANG-PINGLI, HUNGTSO, KO-YANG
OwnerRAYDIUM SEMICON